I have the same problem. Ever since upgrading to ICS I frequently loose all sound on my Droid Razr. The only way (I am sure there are others) I have of getting the sound back is to go to the built-in Alarm & Timer app and play a ringtone. That works for getting my sound back for all other apps that use sound. This is a bug that should be fixed. Does Android issue anything like service packs or updates to fix bugs?

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